Stem-swelling and photosynthate partitioning in stem mustard are regulated by photoperiod and plant hormones

Xu, Z; Wang, QM; Guo, YP; Guo, DP; Shah, GA; Liu, HL; Mao, A

Stem-swelling and photosynthate partitioning in stem mustard are regulated by photoperiod and plant hormones

Xu, Z Wang, QM Guo, YP Guo, DP Shah, GA Liu, HL Mao, A

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Publication Type:: Journal Article
Citation:: Environmental and Experimental Botany, 2008, 62 (2), pp. 160 - 167
Issue Date:: 2008-03-01

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Field	Value	Language
dc.contributor.author	Xu, Z	en_US
dc.contributor.author	Wang, QM	en_US
dc.contributor.author	Guo, YP	en_US
dc.contributor.author	Guo, DP	en_US
dc.contributor.author	Shah, GA	en_US
dc.contributor.author	Liu, HL	en_US
dc.contributor.author	Mao, A	en_US
dc.date.issued	2008-03-01	en_US
dc.identifier.citation	Environmental and Experimental Botany, 2008, 62 (2), pp. 160 - 167	en_US
dc.identifier.issn	0098-8472	en_US
dc.identifier.uri	http://hdl.handle.net/10453/14920
dc.description.abstract	The experiment was conducted to study the relationship between stem-swelling and photoperiod and growth hormones by comparing stem swelling with non-stem-swelling stem mustard (Brassica juncea var. tsatsai) plants about their growth characteristics and levels of endogenous gibberellin and cytokinin under different photoperiods. The results here showed that plant biomass was higher in 12-h photoperiod compared to that in long day (LD) and short day (SD), whereas stem growth was much stronger in LD compared to 12-h photoperiod and SD. Exogenous application of 1.0 mM gibberellic acid (GA3) accelerated stem elongation in SD, but 8.9 μM benzyladenine (BA) failed. The shape of the swollen stem was also found to be associated with day length: a LD promoted stem elongation, while a 12-h photoperiod made the stem oval swollen. Also, stem was shown to have no sign of swelling in plants in SD with a relatively poor growth. The further studies showed that the largest proportion of 14C photosynthate was allocated to the swelling stems in stem-swelling plants, but to expanded leaves in non-stem-swelling plants, and endogenous gibberellin A1 (GA1) and zeatin + zeatin riboside (ZRs) were higher in LD compared to 12-h photoperiod and SD. These results from this experiment indicate that stem growth and swelling is a physiological process of hormonal control, and the photoperiod possibly exerts its influence by altering the balance between the levels of endogenous gibberellins and cytokinins. © 2007 Elsevier B.V. All rights reserved.	en_US
dc.relation.ispartof	Environmental and Experimental Botany	en_US
dc.relation.isbasedon	10.1016/j.envexpbot.2007.08.001	en_US
dc.subject.classification	Plant Biology & Botany	en_US
dc.title	Stem-swelling and photosynthate partitioning in stem mustard are regulated by photoperiod and plant hormones	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	62	en_US
utslib.for	0607 Plant Biology	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
dc.location.activity	ISI:000252791500009	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of the Environment
utslib.copyright.status	closed_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	62	en_US

Abstract:

The experiment was conducted to study the relationship between stem-swelling and photoperiod and growth hormones by comparing stem swelling with non-stem-swelling stem mustard (Brassica juncea var. tsatsai) plants about their growth characteristics and levels of endogenous gibberellin and cytokinin under different photoperiods. The results here showed that plant biomass was higher in 12-h photoperiod compared to that in long day (LD) and short day (SD), whereas stem growth was much stronger in LD compared to 12-h photoperiod and SD. Exogenous application of 1.0 mM gibberellic acid (GA3) accelerated stem elongation in SD, but 8.9 μM benzyladenine (BA) failed. The shape of the swollen stem was also found to be associated with day length: a LD promoted stem elongation, while a 12-h photoperiod made the stem oval swollen. Also, stem was shown to have no sign of swelling in plants in SD with a relatively poor growth. The further studies showed that the largest proportion of 14C photosynthate was allocated to the swelling stems in stem-swelling plants, but to expanded leaves in non-stem-swelling plants, and endogenous gibberellin A1 (GA1) and zeatin + zeatin riboside (ZRs) were higher in LD compared to 12-h photoperiod and SD. These results from this experiment indicate that stem growth and swelling is a physiological process of hormonal control, and the photoperiod possibly exerts its influence by altering the balance between the levels of endogenous gibberellins and cytokinins. © 2007 Elsevier B.V. All rights reserved.

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http://hdl.handle.net/10453/14920